diff --git a/osu.Game/Screens/Edit/Screens/Compose/RadioButtons/DrawableRadioButton.cs b/osu.Game/Screens/Edit/Screens/Compose/RadioButtons/DrawableRadioButton.cs
index a6c0f48f1f..48cc7f3379 100644
--- a/osu.Game/Screens/Edit/Screens/Compose/RadioButtons/DrawableRadioButton.cs
+++ b/osu.Game/Screens/Edit/Screens/Compose/RadioButtons/DrawableRadioButton.cs
@@ -29,8 +29,7 @@ namespace osu.Game.Screens.Edit.Screens.Compose.RadioButtons
         /// </summary>
         public Action<RadioButton> Selected;
 
-        private Drawable bubble;
-
+        private readonly Drawable bubble;
         private readonly RadioButton button;
 
         public DrawableRadioButton(RadioButton button)
diff --git a/osu.Game/Screens/Edit/Screens/Compose/RadioButtons/RadioButtonCollection.cs b/osu.Game/Screens/Edit/Screens/Compose/RadioButtons/RadioButtonCollection.cs
index ad24a1da52..08473eaeba 100644
--- a/osu.Game/Screens/Edit/Screens/Compose/RadioButtons/RadioButtonCollection.cs
+++ b/osu.Game/Screens/Edit/Screens/Compose/RadioButtons/RadioButtonCollection.cs
@@ -17,7 +17,7 @@ namespace osu.Game.Screens.Edit.Screens.Compose.RadioButtons
             get { return items; }
             set
             {
-                if (items == value)
+                if (ReferenceEquals(items, value))
                     return;
                 items = value;
 
diff --git a/osu.Game/osu.Game.csproj b/osu.Game/osu.Game.csproj
index 886d3313c6..e1425ff8b8 100644
--- a/osu.Game/osu.Game.csproj
+++ b/osu.Game/osu.Game.csproj
@@ -564,7 +564,6 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Rulesets\Edit\Tools\HitObjectCompositionTool.cs" />
     <Compile Include="Rulesets\Edit\Tools\ICompositionTool.cs" />
-    <Compile Include="Rulesets\Edit\Tools\SelectionTool.cs" />
     <Compile Include="Rulesets\Edit\HitObjectComposer.cs" />
     <Compile Include="Rulesets\Edit\ToolboxGroup.cs" />
     <Compile Include="Rulesets\Judgements\DrawableJudgement.cs" />